astrolabe | Treatise | treatise | Astrolabe | Treatise on the Resurrection | Mariner's astrolabe | Hawkins' Treatise of Pleas of the Crown | Great Astrolabe Reef | ''A Treatise of the Pleas of the Crown: or a system of the principal matters, relating to that subject, digested under their proper heads | A Treatise of Human Nature |
The English author Geoffrey Chaucer (ca. 1343–1400) compiled a treatise on the astrolabe for his son, mainly based on Messahalla.
The astrological order of the days was explained by Vettius Valens and Dio Cassius (and Chaucer gave the same explanation in his Treatise on the Astrolabe).